Package includes:
2Pcs x Cyclone Tube (plastic bottle not included)

Description
Material: Plastic
Size: approx. 4.8*3.2*3.2cm/1.89\'*1.89\'*1.25\'

Note: Colors are sent randomly. If you buy more than one, perhaps you will receive all the same colors. Hope you can understand.
Watch your vortex spin in the bottle!!!This is a great educational and fun experiment and
activity for school classes, homeschoolers, scouts and any other group. Create a tornado from two
2 liter plastic bottles, water and a colorful plastic connecting tube. Swirling water creates a funnel-shaped
vortex as it drains from one bottle to another. You can create different ways to work with it by timing the
water draining, using bits of paper or food coloring or lamp oil.